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Unconfigure T5240 HW Raid controller from ok prompt

We ran into a problem with a set of Sun T5240 servers. We got them from another business unit in our company. They had used and configured the LSI Raid controller that’s built into the server.

Normally you can use raidctl from the OS to unconfigure or reconfigure the RAID controller. Unfortunately, any time we tried to boot from net or DVD to jumpstart the server it would panic.  Even doing a “boot cdrom -s” would panic shortly after displaying the banner.

I called Sun support and they showed how to unconfigure the RAID controller from the ok prompt. Please note that this is not generally supported and I take *NO* responsibility for any damage you might do by trying to follow these instructions.

From the OK prompt:

setenv fcode-debug? true
setenv auto-boot? false

Wait for reboot to ok prompt. Next we select the path for the controller. First find the path. Run ‘show-disks’ and hit ‘q’ to quit out. We don’t Actually want to select one, we just want the list. In the case of our server, the path for the RAID controller was “/pci@400/pci@0/pci@8/scsi@0”. Be aware that the output of show-disks includes “/disk” at the end of that. Leave this off in the commands, we just want the point up to “scsi@0”


Now select the controller:

select /pci@400/pci@0/pci@8/scsi@0

Under normal circumstances, this will simply display the volumes. If like me you’ve done something stupid like mix the disks around, it will display a ton of errors forever. You’ll have to send a break to get back to the OK prompt. You will then have to repeat the previous commands except for the show-volumes before proceeding.

Either way, take note of how many volumes were there [ie. Volume 0 and Volume 1].

For each volume starting at the highest number do the following: Note: For each volume number, repeat the command until it complains that the volume is not found. I had to do 1 delete-volume around 4-5 times before it was really deleted.

1 delete-volume
0 delete-volume

Once you’ve run those commands repeatedly for each volume until it complains that the volume doesn’t exist, you should now be able to boot from a DVD or do a jumpstart install normally.

Don’t forget to turn on auto-boot? and turn off fcode-debug?

setenv fcode-debug? false
setenv auto-boot? true


Pingback from How to destroy hardware raid on T5120 – Page 3 – SUN Solaris – The UNIX and Linux Forums
Time June 21, 2009 at 6:38 am

[…] Another method from the ok> prompt Fearthepenguin.net Unconfigure T5240 HW Raid controller from ok prompt […]

Comment from Pasha
Time August 25, 2015 at 11:43 am

Fantastic! It works on Netra T2000 although I had to destroy the volume 0.
This is really a butt-saver page!

Comment from Camilla
Time December 3, 2015 at 7:24 pm

Try raidctlIf intllsaed it should give a list of devices and their status. It’s easy to then script it via cron to send a notification via email etc .

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